f IMAGING IN KARST TERRAIN USING ELECTRICAL RESISTIVITY TOMOGRAPHY AND SURFACE WAVE METHODS

Electrical resistivity tomography (ERT) profiles were acquired along traverses at two study sites (Jefferson City and Lane Springs) in central Missouri using overlapping arrays consisting of 68 electrodes spaced at 5-foot intervals. Multi-channel analyses of surface wave (MASW) data were acquired at 50 ft intervals along each traverse; both 1-D and 2-D shear-wave velocity profiles were generated. The primary objective was to map variable depth to top of rock based on both soil/rock resistivity and shear-wave velocity contrasts.